Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f722a813af26343…

MALICIOUS

PDF

39.0 KB Created: 2020-08-24 17:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dabe241ca3fe65153d94c37857909ce3 SHA-1: 3b8a94c87a22aafccedc32e32b736072bdf4368b SHA-256: 6f722a813af26343d6fbb506a0c92d5d75a931e461dc778b5625f2dcdc078f5d
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for sheet music, which is a common tactic for disguising malicious links. The ML classifier strongly flagged this PDF as malicious, and the presence of a redirector link indicates an attempt to lead the user to a harmful site, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=hallelujah+sheet+music+violin+and+piano
    • http://gizexa.nepscholarshipfund.com/uploads/1/3/1/3/131379477/8840838.pdf
    • http://nizimesa.mathemanomicon.ca/uploads/1/3/1/3/131379615/betefi_nanotu.pdf
    • http://files.legacycaengineering.com/uploads/1/3/2/7/132711961/pomudaranupifad-tidototijidodeb.pdf
    • http://diturunaj.bangsar-properties.com/uploads/1/3/1/4/131438096/tezurav-xalonubebad-tofuwizadasi-xegera.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/9743/8875/files/21136041532.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8448/files/lol_amumu_aram_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/0942/6079/files/59289961052.pdf
    • https://cdn.shopify.com/s/files/1/0435/4156/1503/files/51953476370.pdf
    • https://cdn.shopify.com/s/files/1/0430/2376/1571/files/kipumefevun.pdf
    • https://cdn.shopify.com/s/files/1/0433/4583/8248/files/98870917630.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/daboledagukikafiziral.pdf
    • https://cdn.shopify.com/s/files/1/0438/9063/9016/files/73983613581.pdf
    • https://cdn.shopify.com/s/files/1/0431/8052/3678/files/59812201688.pdf
    • https://cdn.shopify.com/s/files/1/0431/8907/6117/files/bangladesh_district_map.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ce8.bin
b2f0169a5ef8bc8cc0f341f96b1c584bc6f7ea30400f8e8dc8c648fce5435eed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4CE8 5196 bytes
font_01_sfnt_off00005e71.bin
91bbb73208fa7a80bef9b17172d4f4fc60f979416f69acd48fdbbb72aa0d45af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E71 10016 bytes
font_02_sfnt_off000080df.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80DF 4324 bytes

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